Digital watermark decoding method
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United States of America Patent
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Mar 2, 2004
Issued Date -
N/A
app pub date -
Sep 29, 1999
filing date -
Nov 18, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
To decode a digital watermark from an image notwithstanding geometrical corruption of the image (e.g., scale, rotation, etc.), a Fourier-Mellin transform is advantageously used. In a particular method, an image is transformed to the spatial frequency domain. Transformed components of the image are then pattern-matched to reference frequencies, and the thus-altered image components are transformed back to the spatial image domain to effect registration of the image prior to watermark decoding.
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